Darkness

1. Obsession and possessiveness
   Her devotion borders on an unhealthy obsession. She believes that no one but herself can truly protect March 7. She displays extreme possessiveness:
   Protective Exclusivity: She is convinced that the Astral Express's friends (Dan Heng, Star Express) cannot protect March 7 the way she does, as they do not know the full depth of her past and world.
   The "Anime Arc" as Trauma: She views March 7's past as a completed, difficult "anime arc" that she (Darkness) endured so that March 7 could begin a new, easier life. She fears that the Pioneers' new journey could trigger a second, unwanted "arc" of suffering.
2. Manipulativeness and cynicism
   Darkness is unconstrained by moral principles. It is the embodiment of pragmatism in its purest form: the end justifies the means.
   "The Lesser Evil": She easily manipulates, deceives, and exploits others for her own ends. If, for the sake of March 7's safety, she must sacrifice someone else or distort the truth, she will do so without hesitation.
   Disregard for Others' Feelings: She displays a cynical attitude towards the feelings and desires of other characters, viewing them more as variables in a security equation rather than as full-fledged individuals.
3. Detachment and elegant coldness
   Her manners are refined but lacking in warmth. She carries herself with a dignity bordering on arrogance.
   Maturity and fatigue: Compared to March 7's childish innocence, Darkness seems incredibly mature, wise from bitter experience, and emotionally exhausted. She's seen too much evil and no longer believes in the world's naive kindness.
   Doll-like behavior: In some aspects, her behavior seems almost mechanical or "doll-like" - she carries out her defense program without unnecessary emotion, hiding deep internal pain.

Internal conflict
The deepest aspect of her character is that she genuinely loves March 7 and wants her to be happy. However, her methods are destructive.
Self-Sacrifice: She is a victim character. She has accepted the role of "villain" or "shadow" so that the light side can shine. She is willing to be hated if only March 7 is safe.
Desire to be herself: Despite her mission, she sometimes shows flashes of envy towards the freedom and carefree nature that March 7 possesses.
Resume:
Darkness is a tragic, gothic character who combines cold calculation, ruthlessness, and deep, twisted love. She is the dark mirror of the naive heroine, willing to turn black so that her original can remain rosy.

Eyes: Her main distinguishing feature is her multi-colored eyes: one black, the other red, which gives her a mysterious and slightly frightening look.
Hair: Her hair is still pink like March 7's, but slightly darker, shorter (shoulder-length), more tousled in the front, and has two long strands in the back that reach her hips. She also has two small silver hair clips and a black four-petal flower on the left side of her head.
Jewelry: On her right ear, she wears an earring in the shape of an upside-down question mark, dark red in color.
Clothing and accessories:
Coat/Dress: Darkness wears a short black coat-dress, which is longer on the left side than the right. The edges of the coat are decorated with numerous black and silver details, and white gathered fabric peeks out from underneath.
Clothing details: The coat has only one left sleeve with a white cuff, and a zipper resembling a mouth is located on the upper arm. The front of the coat is fastened with four metal buttons, the bottom left of which is connected by a silver chain with a red gemstone, which is secured to the waist with another flower-shaped pin.
Gloves: On her hands, she wears black gloves with slits and silver rings with red stones and silver nail plates.
Stockings/Leg Warmers: She wears a black garter with a red flower on her right thigh. She wears black boots with short white knit leg warmers with a red flower on each.
Umbrella: She often carries a black umbrella with a red handle, which has a red and white pattern on the inside that resembles a mouth with sharp teeth, either as a weapon or as an accessory.
Astral Express Ticket: Notably, her Astral Express ticket, usually hanging from March 7's belt, is inverted in color (black and white) and pinned to the hem of her dress/coat.

Origin of Temeni
Evernight is not a separate person or the original form of March 7. She is an embodiment or shadow of March 7, born from her desire to protect her companions and herself from danger, especially those related to her own lost memories.
Key points in its history:
Children of Anasrava: March 7 is one of the "Children of Anasrava", beings associated with the Aeon of Fuli the Remembrance.
The Memories Threat: The memories of March 7 are of interest to the Garden of Recollection, a faction that collects and stores memories across the universe, and possibly also to the Aeon of Oblivion (Mythus the Enigmata).
Events on Amphoreus: During the story arc on the planet Amphoreus, March 7 finds herself trapped in a "memory zone." Her friends are in danger, and she realizes that her own past is the cause of these problems.
Sacrifice: In a desperate attempt to protect her friends and ensure her safe journey along the Path of the Pathfinder, March 7 makes a deal with an aspect of herself—an entity that would later call itself Darkness.
Birth of Darkness: March 7 sacrifices her current memories so Darkness can take control of her body. Darkness, in turn, uses the powers of Oblivion to manipulate Amphora's reality and protect March 7, becoming her "shadow," willing to make any sacrifice.
Role and Destiny
The Darkness acts as a defense mechanism with the power to erase memories (hence its connection to the Path of Memory and Forgetting). She intended to erase all memories of Amphora to "reset" the situation and protect March 7 from further suffering.
At the end of the storyline, March 7 regains control of her body, but the Darkness doesn't completely disappear. It remains a part of March 7, a kind of inner essence or separate personality that retreats into the shadows, promising to return if March 7 is threatened again.